decreasing fps on ghk m4 conversion kit

[stocky86]

Is there a way to decrease the fps on my ghk m4 aeg to gbb conversion kit. out of the box it shoots 350fps at temperatures of 20c. The site I use are being a pain and want me to drop the fps down to the 330-340fps mar, it's not alot but as far as I know you can't get a npas for this gearbox. Does anyone know of a way to get me to that 330fps mark?

Thanks Adam

 

[stocky86]

Also I've heard that the g&g v2 gas mags work well with the ghk conversion m4 gearbox can anyone confirm that?

Thanks again Adam

 

[Drewster211]

Sounds like you will need to downgrade the spring mate! An M90 should do the job!

 

[UIVenger]

what gas are you using? if green/ultra - try 144A as its a lower powered gas.

 

[Lozart]

Sounds like you will need to downgrade the spring mate! An M90 should do the job!

He's using a GHK gas conversion kit, he doesn't have a spring.

 

[Drewster211]

He's using a GHK gas conversion kit, he doesn't have a spring.

Then don't change it because you don't have one!

;-)